First, you have to be sold on the need for a tablet. If you can't define that for yourself, then you don't need an iPad.
Next, you need to understand the value of the Apple Ecosystem. There is more to an Apple device than just the hardware / software stack. The way Apple devices work together through iCloud is terrific. (I have a new 2017 MacBook Pro and an iPhone 6+, and they all work together great. Or, bigly, I guess.)
Last, I just got my second 10.5 inch 64GB iPad. (I returned my first until a good sale came along, which it just did.) If you are convinced that you want a tablet, there is no other one than this one. You might go to 256Gb, but for me, 64 was the right size. But the technology in this is worlds better than any other tablet. The display, especially, is years ahead of anything else. The speed is phenomenal. It is truly in a class by itself. If, which is a big "if", you can put up with the price.
Of course, I was coming from an iPad3, so anything new was a revelation. The regular 9.7 iPads are really nice. The Pros are, too. I mean, these are really nice devices. But I'm smitten with the 10.5 inch form factor. It is, for me, the best of all.
But, if I have to push any of these things to you, then you don't really want a tablet to begin with, much less an iPad. They present a much different use case than a Mac does. Touch devices are more about consumption than production. If you want to do personal productivity or development work, the iPad isn't the right device for you. Many will disagree, saying that a keyboard will mitigate that. Good for them. For me, and I suspect that most iPad users agree, that's not the reality. Tablets have their place, and the iPad is a tablet. They don't replace a laptop or a desktop. But they are the best in the tablet space. And the 9.7 inch is a great device, overall.